ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2271

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power management control ECU, a short in the IG output circuit inside the power management control ECU, a short between the power management control ECU and relay, or a short in the relay is detected.

DTC No. DTC Detection Condition Trouble Area
B2271 The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside the power management control ECU is open or shorted.

  • AM2 fuse

  • IG1 relays

  • IG2 relay

  • Power management control ECU

  • Instrument panel junction block assembly

  • Wire harness or connector

WIRING DIAGRAM

A0043DZE12

INSPECTION PROCEDURE

Note


  • When the power management control ECU is replaced with a new one and the cable from the negative (-) auxiliary battery terminal is connected, the power source mode becomes on (IG) mode. When the auxiliary battery is removed and reinstalled, the power source mode that was selected when the auxiliary battery was removed is restored.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the L5 and L6 power management control ECU connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      L5-1 (AM22) - Body ground Always 9.5 to 16 V
      L6-7 (AM21) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L5-5 (E01) - Body ground Always Below 1 Ω
      L5-6 (E1) - Body ground Always Below 1 Ω
      L6-4 (E12) - Body ground Always Below 1 Ω
      L6-5 (E02) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

    OK

  3. INSPECT NO. 1 INTEGRATION RELAY


    1. A0040X5E16
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 Integration Relay)

      Remove the No. 1 integration relay from the engine room relay block assembly.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-2 - 1A-3 20°C (68°F) 130 to 230 Ω

    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)


    1. A0041BJE12
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-25 - 2B-4 20°C (68°F) 52.32 to 79.32 Ω
      2B-25 - 2B-6 20°C (68°F) 52.32 to 79.32 Ω
      2B-4 - 2B-6 Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL J/B)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L6-2 (IG1D) - 2B-25 Always Below 1 Ω
      L6-2 (IG1D) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-4 - Body ground Always Below 1 Ω
      2B-6 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A21-2 (IG2D) - 1A-2 Always Below 1 Ω
      A21-2 (IG2D) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY)

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)


    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-3 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

    OK

  9. CHECK POWER MANAGEMENT CONTROL ECU


    1. A0042SRE30
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      Install the instrument panel junction block assembly.

    2. Install the engine room relay block.

    3. Reconnect the A21 and L6 connectors.

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A21-2 (IG2D) - Body ground Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2.5 V or more
      L6-25 (IG1D) - Body ground Power switch on (IG) Output voltage at terminal AM21 or AM22 is -2.5 V or more

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here